Eyepiece adjustment for surveyors&#39; telescopes.



W. L. BIERBRAUER & P. A. H. SAOHSE.

EYEPIEGE ADJUSTMENT FOR SURVEYOES TELESOOPES.

APPLIGATION FILED MAY'ZO, 1914.

Patented Mar. 2, 1915.

THE NORRIS FETERSCQ. FKOTO-LITHO" WASHINGTON, D. C.

UNITED @TATES PAT anion.

WILLIAM L. BIERBRAUER AND PAUL A. H. SACI-ISE,-OF CHICAGO, ILLINOIS,ASSIGNORS T0 EUGENE DIETZGEN COMPANY, FAGTORY, OF CHICAGO, ILLINOIS, ACORPORA- TION OF ILLINOIS.

Specification of Letters Patent.

Patented Mar. 2, rain.

Application filed May 20, 1914:. Serial No. 839,689.

To all whom it may concern:

Be it known that we, WILLIAM L. Binn- BRAUER and PAUL A. H. Snot-Isa,both residing at Chicago, in the county of Cook and State of Illinois,have invented a certain new and useful Improvement in EyepieceAdjustments for Surveyors Telescopes, of which the following is aspecification.

It is well known by those skilled in the art of making and usingsurveyors transits, levels or other telescopes that it is necessary toprovide means for adjusting the inner end of the eye-piece in adirection transverse to the axis of the main tube or case. Usually thebody of the eye-piece is formed of comparatively thin tubing and theadjustment at the inner end thereof is accomplished by three or more setscrews passing radially through the main tube on the outside thereof andengaging a ring which encircles the eye-piece near the inner endthereof. It has been found that adjustments constructed along such planhave certain disadvantages: In the first place, the ring, when movedappreciably from central position, frequently distorts the body of theeye-piece.a result which is both injurious to the instrument and rendersit inaccurate; second, the set screws and ring are apt to bindespecially if the ring be adjusted any appreciable distance from centralposition and this renders the operation ofadjusting both difiicult andsomewhat unpleasant to those accustomed to manipulating delicateinstruments.

It is an object of our invention to provide a construction by whichthese objectionable characteristics are avoided.

Another object of our invention is to provide a construction such thatthe distortion of the eye-piece will be avoided and atthe same time, theeye-piece may be readily removed for cleaning the lenses or otherpurposes and replaced without disturbing the adjustment.

We accomplish these objects by the construction illustrated in theaccompanying drawings in which- F1gure 1 1s a slde view of a telescopeembodying our invention, part of the main tube or casing being brokenaway to reveal the internal parts. Fig. 2 is similar to Fig. 1 exceptthat the sleevewhich supports the eye-piece is shown in section and aportion of the eye-piece itself is broken away to better illustrate theconstruction. Fig. 3 is a transverse section taken on the line 3-3, Fig.2.

Similar numerals refer to similar parts throughout the several views.

The main tube or casing which is of ordi nary constructionis providedwith an obj ect glass 2. At the opposite end of the tube is an eye-piece8 of such construction, the body being tubular and containing suitablelenses. Inclosing the eye-piece for' the major portion of its length isa sleeve 4 made of tubular material of'substantial thickness andsupported at the rear or outer end in a bushing-5 screwed onto orotherwise fastened to the rear end of the main tube. At the point wherethe bushing contacts the eye-piece, the surface is rounded with theresult that the outer end of the eyepiece willbe held fixed whilethe-inner end is free to be adjusted.

At the inner endof sleeve 4: is a ring 6 rigidly fastened thereto. Saidring may be integral with thesleeve or soldered thereto but bypreference screws onto the sleeve in the manner shown in Fig. 2. Thering and sleeve are adjusted transversely to the axis by set screws'7.These screws in the present instance being four in number and pen'etrating the main tube 1. Ring 6 is tapped and threaded to take theinner end of said screws.

It will be seen from the foregoing and from the drawings that theeye-piece is inclosed by a tubular element which bears at one end in abushing at the rear end of the main tube and at the inner end bears uponadjusting set screws. The result is that the stresses and strains areborne by said tubular element, and this relieves the eye-piece andprevents distortion thereof. It will be noted, also, that this effect isobtained 'without the multiplication of elements, for the ring and thesleeve may be regarded as a single piece, since they operate as a singlepiece and may be integral if desired.

A. slot 8 is formed in the side of sleeve 4: which receives the head ofa screw pin 9, the threaded shank of said pin screwing into the side ofthe eye-piece as shown in Fig. Slot 8 is open at the rear or outer endand hence permits the eyepiece to be Withdrawn without disturbing theadjustment of the sleeve. Consequently the eyepiece may be replaced bysimply inserting it into the sleeve and the user may be assured that itwill be brought to the same position as before. In order to provide forlongitudinal adjustment of the eye-piece rel atively to the main tube,slot 8 preferably has two portions, one of which is oblique and theother parallel to the axis of the eyepiece. The result is that when thepin 9 is in the inner, oblique portion of the slot, the eye-piece may beadjusted longitudinally without disturbing its axial position by merelyrotating the eye-piece, and furthermore the eye-piece cannot bewithdrawn, ordinarily, by merely a straight outward pull. This lessensthe danger of accidental dislodgment.

Having thus described our invention, what we claim as new and desire tosecure by Letters Patent, is:

1. In a telescope, the combination of a main tube, an eyepiece having acylindrical body, asleeve surrounding the body of the eye-piece forsupporting the same, the outer end of said sleeve being held againsttrans verse movement in said tube and the inner end of said sleeve beingadjustable transversely to the axis of said tube for thereby adjustingthe eyepiece.

2. In a telescope, the combination of a main tube, a sleeve within saidtube, means at the outer end of said tube for supporting the outer endof said sleeve and preventing transverse movement thereof, means at theinner end of said sleeve for adjusting it transversely to the axis ofsaid tube, and an eye-piece fitting into and completely supported bysaid sleeve.

3. In a telescope, the combination of a main tube, a bushing at theouter end of said tube, an eye-piece having a cylindrical body, a sleevesurrounding the body of the eye-piece for supporting the same, and meansfor adjusting the inner end of the sleeve transversely to the axis ofthe main tube to thereby accomplish the adjustment of the eye-piece.

4. In a telescope, the combination of a main tube, an eye-piece having acylindrical body, a sleeve surrounding the body of the eye-piece forsupporting the same, means at the outer end of said sleeve forpreventing transverse movement thereof with respect to the tube, andadjusting means at the inner end of said sleeve for adjusting saidsleeve and the inner end of the eyepiece transversely to the axis of thetube, said adjusting means including set screws operable from theoutside of said tube.

5. In a telescope, the combination of a main tube, an eye-piece locatedchiefly within said tube, said eye-piece having a cylindrical body, asleeve into which the body of the eye-piece slidingly fits, means at theouter end of said tube for supporting the outer end of said sleeve andholding it against transverse movement, means at the inner end of saidtube adjacent to the inner end of the eye-piece for reinforcing saidsleeve, and means for adjusting the inner end of the sleeve transverselyto the main tube.

6. In a telescope, the combination of a main tube, a sleeve locatedchiefly within said tube, an eye-piece fitting slidingly in said sleeve,and a pin projecting from the side of said eye-piece, said sleeve havingan open ended slot for receiving and guiding said pin, and permittingthe eye-piece to be removed from the sleeve without removing the sleevefrom the main tube.

7. In a telescope, the combination of a main tube, a sleeve locatedchiefly within said tube, and being held against transverse movementrelatively to the axis of said tube, means at the inner end of saidsleeve for adjusting it transversely to the axis of the tube, and aneye-piece fitting slidably within said sleeve, said eye-piece beingwithdrawable from said sleeve, whereby the eyepiece may be separatedfrom the rest of the device without disturbing the adjustment of thesleeve in the tube.

8. In a telescope, the combination of a main tube, a sleeve locatedwithin said tube, the outer end of the sleeve being held concentric withthe tube and the inner end being adjustable transversely to the axis ofthe tube, an eye-piece supported solely by said sleeve and having acylindrical body fitting slidably thereinto, and a slot and pinconnection between the eyepiece and the sleeve, the slot being open atthe end for the purpose described.

9. In a device of the class described, the combination of a main tube,an eye-piece, a sleeve Within said tube forming the sole support forsaid eyepiece, and means for adjusting said sleeve within said tubetransversely to said tube.

10. In a telescope, the combination of a main tube forming the outercasing for the telescope, an eye-piece the body whereof is tubular, asleeve within which the tubular portion of the eye-piece fits, and meansfor adjusting said sleeve within the tube transversely to the axisthereof.

11. In a telescope, the combination of a main tube forming the outercasing for the telescope, an eye-piece having a tubular body, a sleeveapproximately coextensive in length with the body of the eye-piece andforming the sole support therefor, and means for adjusting said sleevetransversely to the axis of the device, said eye-piece beinglongitudinally adjustable within said sleeve. I In witness whereof wehave hereunto subscribed our names in the presence of two witnesses.

WILLIAM L. BIERBRAUER. PAUL A. H. SACHSE. Witnesses:

ESTHER W. OsTRoM, P. L. LOEST.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. 0.

